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3525 queston
By kell, Section Homebrewed Electricity Posted on Fri Sep 17th, 2004 at 02:17:25 PM MST
pwm feedback

The circuit diagrams I have found for the 3525 all have the inverting input (pin 1) and the compensation (pin 9) tied together, and use the non-inverting input (pin 2) for the feedback.
The manufacturers all use the same cruddy datasheet that doesn't seem to have an explicit answer to a question I have. I would like to use inverting feedback. I don't know whether to use compensation pin 9, or inverting input pin 1, and where to connect the other two pins.

3525 queston | 3 comments (3 topical, 0 editorial)

Re: 3525 queston (3.00 / 0) (#1)
by drdongle (Dr.Dongle1@juno.com) on Fri Sep 17th, 2004 at 05:16:53 PM MST
(User Info)

Contact one for the Mfgrs applications engineers.

Carpe Vigor
Dr.D
Carpe Vigor, Dr.D

Re: 3525 queston (3.00 / 0) (#2)
by Flux on Sat Sep 18th, 2004 at 12:53:18 AM MST
(User Info)

The front end of the 3525 seems a bit odd. It works as a normal op amp if you keep the reference between 2.5 and 5 volts and keep any feedback resistor above about 47k.

If you take the reference much below 2.5v it behaves oddly and looses control. I have used it with inverting control.

Also watch the shut down pin, if you are not using it, ground it or it may cause you to loose one output pulse.

Flux

Re: 3525 queston (3.00 / 0) (#3)
by Nando (nando37-at-tx-dot-rr-dot-com Correct theanti-spam) on Sun Sep 19th, 2004 at 08:44:58 PM MST
(User Info)

Kell:

I have used the Sg3525 for many years, what is what you want to do, the data sheet gives all the info.
Send to me the schematic you want to do, directly to my email.

Regards

Nando

3525 queston | 3 comments (3 topical, 0 editorial)

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